Posted: 12/09/2013 at 17:53
My "invasive" white one grows between two large trees which take the nourishment from everything else I've tried to grow there, plus the shade, so I'm very happy for them to be there. If they spread too far out, I just give the new seedlings a quick spray of glyphosate with a hand sprayer. The pink ones in another border havn't spread, just two nice big clumps. I love them too.